The LongBinaryOperator interface was introduced in Java 8. It represents an operation on two long values and returns the result as a long value. It is a functional interface and thus can be used as a lambda expression or in a method reference. It is mostly used when the operation needs to be encapsulated from the user. Methods:

1. applyAsLong(): This function takes two long values, performs the required operation and returns the result as a long.

   public long applyAsLong(long val1, long val2)
   

Example to demonstrate LongBinaryOperator interface as a lambda expression .

 

// Java program to demonstrate LongBinaryOperator

​

import java.util.function.LongBinaryOperator;

​

public class LongBinaryOperatorDemo {

    public static void main(String[] args)

    {

​

        LongBinaryOperator longBinaryOperator = (x, y) ->

        {

            return x + y;

        };

​

        System.out.print("343666 + 547477 = ");

        System.out.println(longBinaryOperator

                               .applyAsLong(343666, 547477));

​

        LongBinaryOperator longBinaryOperator1 = (x, y) ->

        {

            return x * y;

        };

        System.out.print("343666 * 547477 = ");

        System.out.println(longBinaryOperator1

                               .applyAsLong(343666, 547477));

    }

}

Reference: https://docs.oracle.com/javase/8/docs/api/java/util/function/LongBinaryOperator.html